When trying to inject MyConfig annotated with @ConfigProperties into MyClass, build fails with:

 ...
 Caused by: jakarta.enterprise.inject.UnsatisfiedResolutionException: Unsatisfied dependency for type mycompany.thing.logging.MyConfig and qualifiers [@Default]
         - injection target: parameter 'cfg' of mycompany.thing.logging.MyClass constructor
         - declared on CLASS bean [types=[mycompany.thing.logging.MyClass, java.lang.Object], qualifiers=[@Default, @Any], target=mycompany.thing.logging.MyClass]
         The following classes match by type, but have been skipped during discovery:
         - mycompany.thing.logging.MyConfig was annotated with @Vetoed

MyConfig class:

@ConfigProperties(prefix = "mycompany.thing.logs")
@Dependent
public class MyConfig {

    @ConfigProperty(name = "sizeLimit", defaultValue = "5G")
    ByteAmount sizeLimit;

    @ConfigProperty(name = "useVDisk", defaultValue = "false")
    boolean useVdisk;

    @ConfigProperty(name = "workerInterval", defaultValue = "PT0.1S")
    Duration workerInterval;

    @ConfigProperty(name = "maintenanceInterval", defaultValue = "PT15M")
    Duration maintenanceInterval;

    //getters
}

MyClass class:

@ApplicationScoped
@Startup
public class MyClass {

    //fields
    
    @Inject
    public MyClass(
        @ConfigProperty(name = "mycompany.thing.storage.data.stuff")
        Path filedir,
        @ConfigProperty(name = "mycompany.thing.storage.keepStuffFor", defaultValue = "P7D")
        Duration keepStuffFor,
        MyConfig cfg,
        @ConfigProperty(name = "quarkus.log.console.format")
        String pattern,
        ScheduledExecutorService ses
    ) {
        //construct 
    }
    
    //rest of class
    
}

The workarround is to remove the @ConfigProperties annotation and specify the prefix on each field

The MyConfig class is based on: https://download.eclipse.org/microprofile/microprofile-config-3.0/microprofile-config-spec-3.0.html#_aggregate_related_properties_into_a_cdi_bean